JPH09201781A - Driving depth adjusting mechanism for nailing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the adjusting amount in response to the difference in the driving depth by a quick operation by turning an adjusting piece to abut it on the different stepped parts, so that the upper part and the lower part thereof are approached or receded. SOLUTION: When an adjusting piece 22 is turned by 90deg. and then is released, it is lifted up by a spring 35, and the stepped parts 17, 18 of the upper part 5a and the upper stepped part 24 of the lower part 5b and the intermediate cut part 25 are abutted. In this case, as compared with the state before turning, the upper part 5a is separated from the lower part 5b by the amount of the stepped difference on the opposite side, so that the overall length of the contact arms 5a, 5b is lengthened. In the working site where ordinary boards and high- specific-gravity boards are mixed, a prescribed driving depth of a nail 40 can be adjusted by such a quick operation that the operation dial and the adjusting piece 22 are pulled downward and turned by 90deg.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adjusting mechanism for adjusting a moving range of a contact arm which constitutes a safety device of a nailing machine to adjust a driving depth of a nail into a material to be driven.

[0002]

2. Description of the Related Art In a nailing machine in which nails are continuously driven by using the power of compressed air or the like, the nailing depth is constant (generally, in general, depending on the hardness of the driven material and the length of the nail. Is provided with an adjusting mechanism for variably setting the projecting length of the driver so that the head of the driven nail has the same depth as the surface of the driven material.

A conventional adjusting mechanism is, for example, an actual open shovel 60-1.
As disclosed in Japanese Patent No. 17072, a safety device that can move along a nose portion and can contact the surface of a material to be driven is divided into a tip portion and an upper end portion, and a screw rod or eccentricity is provided between them. A cam mechanism or the like is interposed so that the tip of the nose portion of the nail driving mechanism is held at different height positions within a predetermined range from the surface of the material to be driven.

[0004]

However, with such a mechanism, it is possible to make fine adjustments for subtle differences in the material of the material to be driven, but, for example, ordinary gypsum board and high specific gravity board are mixed. In the field where it is used for a long time, or where a relatively hard upper material is partially laminated, the screw dial or eccentric cam operation dial is rotated many times to make adjustments. However, there is a problem in that work efficiency is reduced due to the necessity of repeatedly performing.

The present invention solves the above problems and adjusts the driving depth according to the difference in the driving depth between the ordinary plaster board and the high specific gravity board and the difference in the driving depth between the one-ply board and the two-ply board. It is an object of the present invention to provide a driving depth adjusting mechanism capable of easily adjusting the amount by one-touch operation.

[0006]

In order to solve the above-mentioned problems, a driving depth adjusting mechanism of a nail driving machine according to the present invention is provided with a nail injection nose portion and a trigger lever provided at a tip portion of a nail driving machine main body. And a contact arm that is movably arranged in a certain range in the nail driving direction and that protrudes from the tip of the nose portion and presses against the material to be driven to move to activate the trigger lever. In a nailing machine provided with, the contact arm includes an upper part whose upper end faces the vicinity of the trigger lever, and a lower part whose lower end protrudes from the tip of the nose part of the nailing machine and can come into contact with the material to be driven. The adjustment piece is divided into two parts, and the upper part and the lower part are provided with step portions capable of abutting each other facing each other at different heights so as to be relatively rotatable about an axis parallel to the nail driving direction. And then Causes spring biased in a direction in which the step portion is close, characterized in that to approach or away from the said upper and lower portions by abutting the stepped portion differ by rotating one of the adjusting pieces.

It is preferable that the adjusting piece is rotated 90 degrees in the forward and reverse directions so that it is brought into contact with different steps.

Further, it is preferable that a screw portion and an operation dial capable of rotating the shaft are provided on a part of the shaft, and the upper portion or the lower portion is screwed to the screw portion. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a main part of a nailing machine. This nailing machine drives a nailing driver 3 on a nailing machine body 2 by a trigger lever 1 starting operation. (Not shown) is operated to drive out the nails supplied to the nail injection nose portion 4 provided at the tip of the nailing machine main body 2. The nail injection nose portion 4 and the trigger are provided as a safety device. A contact arm 5 is provided between the lever 1 and the lever 1. The contact arm 5 is movably arranged along the nose portion 4 in the nail driving direction, the lower end thereof protrudes from the tip of the nose portion 4, and the upper end thereof is the trigger lever 1.
It is arranged so as to face the free end of the contact lever 6 that is rotatably provided. When the nail is driven, as shown in FIG. 2, the protruding end from the tip of the nose portion 4 is pressed against the material 7 to be driven to move relatively upward and push up the contact lever 6 to trigger the trigger lever. The contact lever 6 can actuate a starting valve (not shown) of the striking mechanism when the starting operation is performed.

The contact arm 5 is set to move up and down within a certain range, the lower moving end is at the position shown in FIG. 1, and the upper end 8 of the portion along the nose portion 4 is set.
Is the position where it abuts the lower surface 9 of the nailing machine body 2 in FIG.

By the way, as shown in FIG. 3, the contact arm 5 is divided into an upper portion 5a whose upper end is arranged near the trigger lever 1 and a lower portion 5b whose lower end is arranged along the tip portion of the nose portion 4. Has been formed.

The upper end portion 10 of the upper portion 5a is supported by the nailing machine main body 2 so as to be movable up and down relative to the contact lever 6 of the contact lever 1 provided side by side with the trigger lever 1 as shown in FIG. As described above, a safety device is configured to push up the end portion of the contact lever 6 with the upward movement of the upper end portion 10 and activate the nail driver in association with the operation of the trigger lever 1.

The lower portion 5b is formed in an annular shape with its lower end covering the outer periphery of the nose portion 4 and can slide along the nose portion 4 to a position where it projects further downward from the tip of the nose portion 4. Further, a female screw 11 (see FIG. 5) is formed on the lower end of the lower portion 5b along the axial direction of the nose portion 4, and the female screw 11 has a male screw part formed on the lower end of the adjusting screw rod 12. 13 is screwed together. Adjustment screw rod 12
An expanded operation dial 14 for rotating the screw rod 12 is formed at an intermediate portion of the shaft, and a shaft 15 extending upward (parallel to the nail driving direction) is integrally formed. Since the adjusting screw rod 12 is rotated by rotating the operation dial 14, the lower end portion of the lower portion 5b can be vertically moved for fine adjustment. Instead of screwing the adjusting screw rod 12 to the lower portion 5b as described above, the shaft 15 may be screwed to the upper portion 5a.

Next, the upper portion 5a of the contact arm 5
An adjusting piece 16 is integrally fixed to the lower end of the. FIG.
As shown in FIG. 5, the adjustment piece 16 is cylindrical, and two step portions 17 and 18 are formed on the lower end of the peripheral edge portion so as to be opposite to each other. The heights a and b of these step portions 17 and 18 are formed to be different from each other. Further, the central through hole 13a has a rectangular cross section, and the inner wall surfaces 19, 20 of the step portions 17, 18 are formed.
Are facing each other. Further, the step portion 1 of the adjusting piece 16
A concave portion 21 is formed on one side surface between 7 and 18.

On the other hand, the adjusting screw rod 1 of the lower portion 5b
A cylindrical adjustment piece 22 is also arranged on the upper part of the second portion 2. A protruding portion 23 is formed in the lower portion of the adjustment piece 22, and an upper step portion 24 and an intermediate step portion 2 having different heights are formed on the upper surface of the peripheral edge portion thereof.
5 and the lower step portion 26 are formed in three steps. The upper step portion 24 and the middle step portion 25 are provided adjacent to each other, and the middle step portion 25 is provided on the opposite side of the upper step portion 24 and the lower step portion 26, respectively. Upper part 24 and middle part 25
The height differences c1 and c2 between the middle step portion 25 and the lower step portion 26 are equal, and this difference is set to be equal to the difference between the heights a and b between the step portions 17 and 18 of the adjusting piece 16. There is.

Further, a higher engaging step portion 27 is formed in the upper step portion 24 in a position retracted near the tubular portion 28, and the upper surface of the engaging step portion 27 and the upper surface of the upper step portion 24 are tangential to the outer peripheral surface of the tubular portion 28. Is continuous through the engaging surface 29 provided on the. The upper surfaces of the middle step portion 25 and the lower step portion 26 intersect with the engagement surface 30 parallel to the tangential direction of the outer peripheral surface of the tubular portion 28. The height difference between the engagement step portion 27 and the upper step portion 24 is formed to be smaller than the height difference c1 or c2 between the opposite side step portions.

Next, as shown in FIG. 5A, the adjusting piece 16 and the adjusting piece 22 each have a through hole 31 at the center thereof.
It is supported by inserting the upper shaft 15 of the adjusting screw rod 12 into a and 31b, and by this, the lower end surface of the upper portion 5a and the upper end surface of the lower portion 5b of the contact arm 5 abut. The adjustment piece 16 is attached to the shaft 15
Does not rotate, but the adjustment piece 22 is rotatably supported.

A protruding wall 33 is formed in the middle of the through hole 31a of the adjusting piece 16, and a spring 35 is arranged between the protruding wall 33 and a spring receiver 34 provided on the upper end of the shaft 15. The spring 35 causes the steps 24, 25, 26 of the lower portion 5b to be formed.
The upper surface of is spring-biased toward the lower surfaces of the steps 17 and 18 of the upper portion 5a. Although the adjustment piece 22 can be pulled down against the spring 35, the downward movement amount is larger than the height difference c1 or c2 between the opposite side steps of the adjustment piece 22 shown in FIG. The height difference d between the engagement step portion 27 and the lower step portion 26 is smaller than the difference d.

Although the adjusting screw rod 12 is also rotated by rotating the operation dial 14, the lower surface of the adjusting piece 22 is provided with recesses 21 formed at intervals in the circumferential direction, and the upper surface of the operation dial 14 is provided. The balls 37 (spring-biased) arranged in the formed recessed holes 36 are arranged so as to be fitted therein, and the adjustment screw rod 12 is clicked to rotate so that it does not rotate carelessly. To prevent. The spring in the adjusting piece 16 also urges the recess 21 of the adjusting piece 22 and the ball 37 on the operation dial 14 to come into close contact with each other.

In the above configuration, in the state of FIG. 5 (a),
Lower part 5b facing step portions 17 and 18 of upper part 5a
The middle step portion 25 and the lower step portion 26 contact each other, the upper step portion 24 of the lower portion 5b fits into the recess 21 of the upper portion 5a, and the inner wall surfaces 19, 20 and the lower portion of the step portions 17, 18 of the upper portion 5a The middle part 25 of 5b and the engagement surface 30 of the lower part 26 face each other, and the upper part 5a and the lower part 5b are close to each other. When changing the abutting step portion, the adjustment piece 22 is pulled down and rotated. However, even if the adjustment piece 22 is pulled down to such an extent that the upper surface of the middle step portion 25 is exposed downward, the adjustment piece 22 is rotated in the A direction (see FIG. 4). In this case, the amount by which the adjusting piece is pulled down is smaller than the height difference d between the engaging step portion 27 and the lower step portion 26, so that the inner wall surfaces 19, 20 of the step portions 17, 18 of the upper portion 5a.
Since the facing state of the lower portion 5b with the engaging surface 30 is not released and both surfaces are engaged, it cannot be rotated in the A direction. On the other hand, adjust the adjustment piece 22 in the B direction (see FIG.
When rotating to (see), it can be rotated without obstacles. When the adjusting piece 22 is rotated 90 degrees and then released, it is pulled up by the spring 35, and as shown in FIG. 2B, the step portions 17 and 18 of the upper portion 5a and the upper step portion 2 of the lower portion 5b are connected.
4 and the middle step portion 25 contact each other. At this time, since the upper portion 5a and the lower portion 5b are separated from each other by the step difference on the opposite side as compared with before rotation, the total length of the contact arm 5 becomes long.
Further, the engagement surface 29 of the upper step portion 24 is the step portion 1 of the upper portion 5a.
Since it faces the inner wall surface 19 of 7, the lower part 5b cannot be rotated. When returning to the original contact between the stepped portions, the adjustment piece 22 may be rotated 90 degrees in the opposite direction.

In this way, by rotating the adjusting piece 22 by 90 degrees and selecting the contact position of the step portion, the upper portion 5a and the lower portion 5b are brought closer to or separated from each other, and the total length of the contact arm 5 is variable. can do. Therefore, when the height of the stepped portion of the adjusting piece 16 and the adjusting piece 22 is nailed under the same conditions (driving air pressure) for a normal plaster board and a high specific gravity board or for single and double boarding, for example. A work in which a normal board and a high-density board coexist by setting the difference c1 or c2 in the generated driving depth to a height corresponding to the adjustment amount when the same driving depth is obtained by the adjustment operation. At the site, the nail 40 can be adjusted to a predetermined driving depth as shown in FIGS. 5 (a) and 5 (b) by one-touch operation of pulling the operation dial 14 and the adjusting piece 22 downward and rotating them by 90 degrees. Driving material 7a, 7
Nail driving can be performed on b with a constant driving depth.

By the way, when the adjustment piece 22 is rotated, the operation dial 14 is also rotated. However, since the rotation of the adjustment piece 22 can be rotated only 90 degrees, the rotation angle of the rotation is small, and the adjustment deviation is small. Moreover, since the adjusting piece 22 rotates only in the forward and reverse directions, the adjustment deviation does not increase even if the switching is repeated.

Further, as shown in FIG. 6, since the same fine adjustment as in the conventional art can be made by rotating only the operation dial 14, when the driving condition itself of the nailing machine is changed, for example, a long hose is placed at a remote place. Since it is used, even if the driving air pressure drops, it is possible to deal with it arbitrarily. Even in this case, it is possible to switch between the normal board and the high specific gravity board with one touch.

In the above-mentioned embodiment, an example in which the step pieces having different heights are formed on the adjusting piece in the upper part and the adjusting piece in the lower part is shown, but the invention is not limited to this example. For example, the height of the step portion of the upper portion is made equal, the step portions of the lower portion which are opposed to each other in the front, rear, left, and right are formed, and the heights of the facing step portions are equal to each other. The parts may be formed at different heights.

[Brief description of drawings]

FIG. 1 is an explanatory view of a main part of a nailing machine according to the present invention.

FIG. 2 is an explanatory view of a main part in a state where a contact arm is pressed against a material to be driven.

FIG. 3 is a front view of a main part of a contact arm.

FIG. 4 is an exploded perspective view of a main part of an adjustment piece.

5 (a) and 5 (b) are cross-sectional views showing the states before and after adjusting the driving depth.

FIG. 6 is a sectional view showing a state in which fine adjustment of the driving depth is added.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trigger lever 2 Nailer main body 4 Nose part 5 Contact arm 5a Upper part 5b Lower part 14 Operation dial 16 Adjustment piece 17, 18 Upper part step part 24, 25, 26 Lower part step part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Kishi 6-6 Nihonbashi Hakozakicho, Chuo-ku, Tokyo Max Co., Ltd. (72) Takayuki Masuno 6-6 6 Nihonbashi Hakozaki-cho, Chuo-ku, Tokyo Max Incorporated (72) Inventor Yasunori Awahara 6-6 Nihonbashi Hakozakicho, Chuo-ku, Tokyo Max Co., Ltd.

Claims (3)

[Claims] 1. A nail-moving nose portion provided at a tip portion of a nailing machine main body and a trigger lever are movably arranged within a certain range in a nail-driving direction, and protrude from a tip end of the nose portion. In a nailing machine provided with a contact arm that moves by pressing against a material to be driven to enable a starting operation of a trigger lever, the contact arm has an upper portion whose upper end faces in the vicinity of the trigger lever, The lower end projects from the tip of the nose part of the nailing machine and is divided into a lower part that can come into contact with the material to be driven, and the upper part and the lower part have step parts that can come into contact with each other at different heights. The oppositely formed adjustment pieces are supported so as to be rotatable relative to each other about an axis parallel to the nail driving direction, and springs are biased in the direction in which the above step portions approach, and one adjustment piece is rotated to cause a different step. To the department A striking depth adjusting mechanism for a nailing machine, characterized in that the upper part and the lower part are brought closer to or separated from each other by bringing them into contact with each other. 2. The driving depth adjusting mechanism for a nailing machine according to claim 1, wherein the adjusting piece is rotated 90 degrees in the forward and reverse directions to be brought into contact with different step portions. 3. A screw part and an operation dial capable of rotating the shaft are provided on a part of the shaft, and the upper part or the lower part is screwed on the screw part.
A driving depth adjusting mechanism for the nailing machine described.